Measuring Relative Power (Insertion Loss) - JDS Uniphase BACKREFLECTION METER RM3750 User Manual

4. Connect the output connector of the DUT to the detector on the front of the meter. The
detector must be equipped with the appropriate detector adapter. The RM meter displays
the DUT absolute power output (Figure 8).
5. If a measurement is to be made at a second wavelength, repeat steps 2 to 4.

Measuring Relative Power (Insertion Loss)

The value for relative power is the negative value of the insertion loss, for example -31 dB
instead of 31 dB. Relative power is displayed by the meter in dB.
To make a relative power measurement of a DUT after performing the setup steps in the
Setting Up the Meter for Loss and Power Measurements section:
1. Press the Power key to set the meter to Relative Power mode. In Relative Power mode, the
meter displays P at the beginning of the reading and rel at the end, for example, P = -0.15
dB rel.
2. Press the λ key to select the wavelength at which the measurement is to be made.
3. Clean the output connector of the measurement jumper and the input connector of the
DUT, and connect the two connectors. Connect the output connector of the DUT to the
detector on the front of the meter. The meter displays the loss due to the DUT (Figure 9).
4. Press the λ key to measure and display the loss at another wavelength.
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RM3 SERIES BACKREFLECTION METER
Figure 8: Measuring Absolute Power
USER'S MANUAL
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